| Species |
Recipient region |
Date of the first record |
|
| Halecium delicatulum | Australia / Bass strait | 1966 |  |
| Halichondria panicea | USA / California Current | 2012 | |
| Haliclona (Haliclona) simulans | Netherlands | 2001 | |
| Haliclona (Haliclona) urceolus | Netherlands | 1985 | |
| Haliclona (Halicoclona) vansoesti | Italy / Central Mediterranean | 2019 | |
| Haliclona (Reniera) cinerea | Netherlands | 1951 | |
| Haliclona (Rhizoniera) rosea | Australia / Bass strait | 1996 | |
| Haliclona (Rhizoniera) rosea | Netherlands | 1951 | |
| Haliclona indistincta | Portugal / Madeira | To 2012 | |
| Haliclona xena | Belgium | To 1988 | |
| Haliclona xena | Germany / North Sea | To 2007 | |
| Haliclona xena | Netherlands | To 1977 | |
| Haliclona xena | USA / California Current | 2012 | |
| Haliclystus salpinx | Netherlands | 2010 | |
| Haliclystus tenuis | Germany / North Sea | 2010 | |
| Haligena elaterophora | Ukraine / Black Sea | 1991 | |
| Halimede tyche | Israel | 1998 | |
| Haliotis discus | China / Yellow Sea | To 2001 | |
| Haliotis discus | Ireland | 1985 | |
| Haliotis fulgens | China / Yellow Sea | To 2001 | |
| Haliotis gigantea | China / Yellow Sea | From 2004 | |
| Haliotis pustulata | Israel | 1961 | |
| Haliotis rufescens | China / Yellow Sea | To 2001 | |
| Haliotis tuberculata | Ireland | 1976 | |
| Halisarca dujardinii | Australia / Bass strait | 1996 | |
| Halisarca dujardinii | Netherlands | 2005 | |
| Halisarca dujardinii | USA / California Current | 2012 | |
| Haloa japonica | France / Biscay Gulf | 1993 | |
| Haloa japonica | France / English Channel | 2013 | |
| Haloa japonica | France / Western Mediterranean | 2003 | |
| Haloa japonica | Italy / Adriatic Sea | 1992 | |
| Haloa japonica | Italy / Western Mediterranean | 2007 - 2012 | |
| Haloa japonica | Spain / Iberian Coastal | 1989 | |
| Halophila decipiens | Greece / Eastern Mediterranean | 2018 | |
| Halophila stipulacea | France / Western Mediterranean | 2021 | |
| Halophila stipulacea | Greece / Central Mediterranean | 1958 | |
| Halophila stipulacea | Greece / Eastern Mediterranean | 1894 | |
| Halophila stipulacea | Italy / Central Mediterranean | 1988 | |
| Halophila stipulacea | Italy / Western Mediterranean | 1995 | |
| Halosarpheia phragmiticola | Ukraine / Black Sea | 2006 | |
| Halothrix lumbricalis | France / Western Mediterranean | 1985 | |
| Halothrix lumbricalis | Italy / Adriatic Sea | 1992 | |
| Halothrix lumbricalis | Italy / Central Mediterranean | 1978 | |
| Halothrix lumbricalis | Turkey / Black Sea | 1998 | |
| Haminoea solitaria | Denmark / Baltic Sea | 2020 | |
| Haminoea solitaria | Denmark / North Sea | 2020 | |
| Haminoea solitaria | Germany / Baltic Sea | 2016 | |
| Haplosporidium armoricanum | France / English Channel | To 1974 | |
| Haplosporidium armoricanum | Netherlands | 1974 | |
| Haplosporidium armoricanum | Spain / Iberian Coastal | 1999 | |
| Haplosporidium nelsoni | France / Biscay Gulf | 1970 - 1979 | |
| Haplosporidium nelsoni | France / Celtic seas | 1979 | |
| Haplosporidium nelsoni | France / English Channel | 1970 - 1979 | |
| Haplosporidium nelsoni | France / North Sea | 1970 - 1979 | |
| Haplosporidium nelsoni | France / Western Mediterranean | 1970 - 1979 | |
| Haplosporidium nelsoni | Ireland | 1993 - 2007 | |
| Hediste diversicolor | Russia / Caspian Sea | 1944 | |
| Heleobia charruana | Belgium | To 2018 | |
| Heleobia charruana | Netherlands | 2018 | |
| Hemigrapsus penicillatus | Belgium | 2003 | |
| Hemigrapsus penicillatus | France / Biscay Gulf | 1994 | |
| Hemigrapsus penicillatus | France / Celtic seas | 1994 | |
| Hemigrapsus penicillatus | France / English Channel | 1994 | |
| Hemigrapsus penicillatus | Netherlands | 2000 | |
| Hemigrapsus penicillatus | Spain / Iberian Coastal | To 1996 | |
| Hemigrapsus sanguineus | Belgium | To 2011 | |
| Hemigrapsus sanguineus | Denmark / Baltic Sea | 2017 | |
| Hemigrapsus sanguineus | Denmark / North Sea | 2011 | |
| Hemigrapsus sanguineus | France / Biscay Gulf | 1999 | |
| Hemigrapsus sanguineus | France / English Channel | 1999 | |
| Hemigrapsus sanguineus | France / North Sea | 2000 | |
| Hemigrapsus sanguineus | Germany / North Sea | 2006 | |
| Hemigrapsus sanguineus | Netherlands | 1999 | |
| Hemigrapsus sanguineus | Romania | 2008 | |
| Hemigrapsus sanguineus | Sweden / North Sea | 2012 | |
| Hemigrapsus takanoi | Belgium | 2003 | |
| Hemigrapsus takanoi | Denmark / Baltic Sea | 2018 | |
| Hemigrapsus takanoi | Denmark / North Sea | 2011 | |
| Hemigrapsus takanoi | France / Biscay Gulf | 1994 | |
| Hemigrapsus takanoi | France / Celtic seas | 1999 | |
| Hemigrapsus takanoi | France / English Channel | 1994 | |
| Hemigrapsus takanoi | France / North Sea | 1999 | |
| Hemigrapsus takanoi | Germany / Baltic Sea | 2014 | |
| Hemigrapsus takanoi | Germany / North Sea | 2007 | |
| Hemigrapsus takanoi | Netherlands | 1999 | |
| Hemigrapsus takanoi | Norway / North Sea | To 2019 | |
| Hemigrapsus takanoi | Poland | 2023 | |
| Hemigrapsus takanoi | Sweden / Baltic Sea | To 2019 | |
| Hemigrapsus takanoi | Sweden / North Sea | 2016 | |
| Hemiliostraca clandestina | Israel | 2018 | |
| Hemimysis anomala | Belgium | 1999 | |
| Hemimysis anomala | Estonia | 2009 | |
| Hemimysis anomala | Finland | 1992 | |
| Hemimysis anomala | France / Celtic seas | 2000 | |
| Hemimysis anomala | France / English Channel | 2000 | |
| Hemimysis anomala | France / North Sea | 2000 | |
| Hemimysis anomala | Germany / Baltic Sea | 1995 - 2015 | |
| Hemimysis anomala | Germany / North Sea | 1997 | |
| Hemimysis anomala | Ireland | 2007 | |
| Hemimysis anomala | Lithuania | 1962 | |
| Hemimysis anomala | Netherlands | 1997 | |
| Hemimysis anomala | Poland | 2002 | |
| Hemimysis anomala | Russia / Baltic Sea / Kaliningrad area | 1962 | |
| Hemimysis anomala | Russia / Baltic Sea / St. Petersburg area | 1992 | |
| Hemimysis anomala | Sweden / Baltic Sea | 1995 | |
| Hemiramphus far | Greece / Eastern Mediterranean | 1943 | |
| Hemiramphus far | Israel | 1925 | |
| Hemiramphus far | Italy / Central Mediterranean | 2013 | |
| Heniochus acuminatus | Ukraine / Black Sea | From 2003 | |
| Heniochus intermedius | Israel | 2014 | |
| Hepatospora eriocheir | Poland | 2020 | |
| Herdmania momus | Greece / Eastern Mediterranean | 2010 | |
| Herdmania momus | Israel | 1955 | |
| Herklotsichthys punctatus | Israel | 1943 | |
| Herposiphonia parca | France / Biscay Gulf | 2005 | |
| Herposiphonia parca | France / Western Mediterranean | 1997 | |
| Herposiphonia parca | Israel | 2015 | |
| Herrmannella duggani | France / Biscay Gulf | 1955 | |
| Herrmannella duggani | Ireland | 1982 | |
| Hesionides arenaria | Ukraine / Black Sea | 1960 - 1969 | |
| Hesionura serrata | Italy / Adriatic Sea | 2010 | |
| Hesperibalanus fallax | France / Biscay Gulf | 2008 | |
| Hesperibalanus fallax | France / English Channel | 1976 | |
| Hesperibalanus fallax | Portugal / Iberian Coastal | 2015 | |
| Hesperibalanus fallax | United Kingdom (Britain) / Celtic seas | 1994 | |
| Hesperibalanus fallax | United Kingdom (Britain) / English Channel | 1994 | |
| Heterolaophonte hamondi | Ireland | 1986 | |
| Heterosaccus dollfusi | Israel | 1992 | |
| Heterosigma akashiwo | Denmark / Baltic Sea | 1989 | |
| Heterosigma akashiwo | Denmark / North Sea | 1989 | |
| Heterosigma akashiwo | France / Biscay Gulf | 1990 | |
| Heterosigma akashiwo | France / English Channel | 1993 | |
| Heterosigma akashiwo | France / Western Mediterranean | 1996 | |
| Heterosigma akashiwo | Germany / Baltic Sea | To 2012 | |
| Heterosigma akashiwo | Germany / North Sea | To 1993 | |
| Heterosigma akashiwo | Iceland | 1987 | |
| Heterosigma akashiwo | Ireland | 1970 - 1976 | |
| Heterosigma akashiwo | Netherlands | To 1992 | |
| Heterosigma akashiwo | Norway / North Sea | 1964 | |
| Heterosigma akashiwo | United Kingdom (Britain) / English Channel | 1950 | |
| Heterosigma carterae | Norway / North Sea | To 1979 | |
| Heterostegina depressa | Greece / Eastern Mediterranean | 1980 - 1988 | |
| Heterostigma sp. | Canada / Hudson Bay Complex | To 2012 | |
| Hexaplex trunculus | France / Biscay Gulf | 1996 | |
| Hexaplex trunculus | France / Celtic seas | 1996 | |
| Hexaplex trunculus | Netherlands | To 2007 | |
| Hexaplex trunculus | Portugal / Azores | To 1919 | |
| Hexaplex trunculus | Portugal / Madeira | To 1994 | |
| Hexaplex trunculus | Spain / Iberian Coastal | 2005 | |
| Hiatella arctica | Portugal / Azores | To 1969 | |
| Hildenbrandia crouaniorum | Bulgaria | 2000 - 2009 | |
| Hildenbrandia occidentalis | Australia / Bass strait | 1981 | |
| Hildenbrandia occidentalis | France / English Channel | 2011 | |
| Hildenbrandia rubra | Australia / Bass strait | 1981 | |
| Hillea fusiformis | Georgia | 2000 | |
| Hillea fusiformis | Romania | 1991 | |
| Hillea fusiformis | Russia / Black Sea | 2001 | |
| Hillea fusiformis | Ukraine / Black Sea | From 1948 | |
| Himantura uarnak | Israel | 1954 | |
| Hincksia granulosa | Australia / Bass strait | 1971 | |
| Hincksia ovata | Australia / Bass strait | 1971 | |
| Hincksia sandriana | Australia / Bass strait | 1971 | |
| Hippocampus kuda | Israel | 1994 | |
| Hippopodina iririkiensis | Israel | 1966 | |
| Hippothoa divaricata | Australia / Bass strait | 1971 | |
| Hobaniella longicruris | Netherlands | To 2009 | |
| Hobsonia florida | Germany / Baltic Sea | 2024 | |
| Holocentrus adscensionis | France / Western Mediterranean | 2019 | |
| Homarus americanus | Denmark / Baltic Sea | 2006 | |
| Homarus americanus | Denmark / North Sea | 2006 | |
| Homarus americanus | France / Biscay Gulf | 2002 | |
| Homarus americanus | France / Celtic seas | 2002 | |
| Homarus americanus | France / English Channel | To 2005 | |
| Homarus americanus | Germany / Baltic Sea | 2014 | |
| Homarus americanus | Iceland | 1965 | |
| Homarus americanus | Ireland | 1961 | |
| Homarus americanus | Netherlands | 2010 | |
| Homarus americanus | Norway / North Sea | 1999 | |
| Homarus americanus | Norway / Norwegian Sea | To 2012 | |
| Homarus americanus | Sweden / North Sea | 2008 | |
| Homarus americanus | United Kingdom (Britain) / North Sea | 2004 | |
| Huso huso | Denmark / Baltic Sea | 2010 | |
| Huso huso | Estonia | 1962 | |
| Huso huso | Latvia | 1962 | |
| Hyastenus hilgendorfi | Israel | 1960 | |
| Hydroides brachyacantha | Greece / Eastern Mediterranean | 2015 | |
| Hydroides brachyacantha | Israel | 1933 | |
| Hydroides dianthus | France / Biscay Gulf | 1927 | |
| Hydroides dianthus | France / Celtic seas | 1927 | |
| Hydroides dianthus | France / North Sea | 2000 | |
| Hydroides dianthus | France / Western Mediterranean | 1967 | |
| Hydroides dianthus | Italy / Adriatic Sea | 1874 | |
| Hydroides dianthus | Italy / Central Mediterranean | To 1899 | |
| Hydroides dianthus | Italy / Western Mediterranean | 1865 | |
| Hydroides dianthus | Ukraine / Black Sea | 2009 | |
| Hydroides dianthus | United Kingdom (Britain) / English Channel | 1970 | |
| Hydroides dirampha | France / Western Mediterranean | 2019 | |
| Hydroides dirampha | Greece / Central Mediterranean | 1981 | |
| Hydroides dirampha | Greece / Eastern Mediterranean | 2014 | |
| Hydroides dirampha | Israel | 1937 | |
| Hydroides dirampha | Italy / Adriatic Sea | 2014 | |
| Hydroides dirampha | Italy / Central Mediterranean | 1979 | |
| Hydroides dirampha | Italy / Western Mediterranean | 1870 | |
| Hydroides elegans | France / Western Mediterranean | To 1944 | |
| Hydroides elegans | Greece / Central Mediterranean | 2012 | |
| Hydroides elegans | Greece / Eastern Mediterranean | 1976 | |
| Hydroides elegans | Israel | 1955 | |
| Hydroides elegans | Italy / Adriatic Sea | 1934 - 1938 | |
| Hydroides elegans | Italy / Central Mediterranean | 1964 | |
| Hydroides elegans | Italy / Western Mediterranean | To 1850 | |
| Hydroides elegans | Netherlands | 1973 | |
| Hydroides elegans | Portugal / Azores | To 2000 | |
| Hydroides elegans | United Kingdom (Britain) / English Channel | 1937 | |
| Hydroides ezoensis | France / Biscay Gulf | 1968 | |
| Hydroides ezoensis | France / Celtic seas | 1974 | |
| Hydroides ezoensis | France / English Channel | 1973 | |
| Hydroides ezoensis | United Kingdom (Britain) / English Channel | To 1976 | |
| Hydroides heterocera | Israel | 1937 | |
| Hydroides homoceros | Israel | 1955 | |
| Hydroides minax | Israel | 1990 | |
| Hydroides norvegica | Australia / Bass strait | 1975 | |
| Hydroides operculata | Israel | 1959 | |
| Hymeniacidon perlevis | Netherlands | To 1951 | |
| Hymeniacidon sinapium | USA / California Current | 2012 | |
| Hypania invalida | Belgium | To 2000 | |
| Hypania invalida | Germany / Baltic Sea | 2010 | |
| Hypania invalida | Germany / North Sea | 1995 | |
| Hypania invalida | Poland | 2010 | |
| Hypanis glabra | Ukraine / Black Sea | From 2004 | |
| Hypereteone heteropoda | Denmark / North Sea | To 2017 | |
| Hypereteone lighti | Germany / North Sea | 2021 | |
| Hypleurochilus bermudensis | Denmark / Baltic Sea | 1934 | |
| Hypnea anastomosans | Greece / Eastern Mediterranean | 2008 | |
| Hypnea anastomosans | Israel | 1972 | |
| Hypnea cervicornis | Italy / Adriatic Sea | 2009 | |
| Hypnea cornuta | Greece / Eastern Mediterranean | 1894 | |
| Hypnea cornuta | Israel | 1945 | |
| Hypnea cornuta | Italy / Central Mediterranean | 2000 | |
| Hypnea corona | Italy / Central Mediterranean | 2000 | |
| Hypnea flagelliformis | Portugal / Azores | 2005 - 2007 | |
| Hypnea musciformis | France / Biscay Gulf | 1896 | |
| Hypnea musciformis | France / English Channel | 1896 | |
| Hypnea musciformis | France / North Sea | 2005 | |
| Hypnea musciformis | Portugal / Azores | 1929 | |
| Hypnea spinella | France / Western Mediterranean | To 2005 | |
| Hypnea spinella | Greece / Central Mediterranean | 2013 | |
| Hypnea spinella | Greece / Eastern Mediterranean | 1979 | |
| Hypnea spinella | Italy / Adriatic Sea | 2010 | |
| Hypnea spinella | Italy / Central Mediterranean | 1985 | |
| Hypnea spinella | Italy / Western Mediterranean | 1989 - 1990 | |
| Hypnea valentiae | France / Biscay Gulf | 2005 | |
| Hypnea valentiae | France / Western Mediterranean | 1993 | |
| Hypnea valentiae | Greece / Eastern Mediterranean | 2009 | |
| Hypoglossum caloglossoides | Israel | 2013 | |
| Hypophthalmichthys molitrix | Belgium | To 1988 | |
| Hypophthalmichthys molitrix | Germany / North Sea | To 1998 | |
| Hypophthalmichthys molitrix | Latvia | 1960 | |
| Hypophthalmichthys molitrix | Netherlands | To 1998 | |
| Hypophthalmichthys molitrix | Poland | 1964 | |
| Hypophthalmichthys molitrix | Russia / Baltic Sea / Kaliningrad area | 1958 | |
| Hypophthalmichthys nobilis | Denmark / Baltic Sea | 1987 | |
| Hypophthalmichthys nobilis | Estonia | 2002 | |
| Hypophthalmichthys nobilis | Latvia | 2002 | |
| Hypselodoris infucata | Greece / Eastern Mediterranean | 2007 | |
| Hypselodoris infucata | Israel | 1965 | |
